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I put a 86 5.0 HO into my 1996 F150. Before putting it into my truck I swapped the E6 heads for E7 heads. I also put an E303 cam into it as well as changed to pistons with valve reliefs. Problem is that my idle is erratic and jumps around about 500rpm and I have a miss at cruising speeds. Timing is set correctly and there are no vacuum leaks. Any ideas on this one? The truck is also mass air and OBD2


Jim
 

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do a self test, see if you have any codes. most hunting or surging idles are caused by a vacum leak.
 
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